Rotary screen mechanism.



P. L. SGHOLL.

ROTARY SCREEN MBGHANIgM. APPLICATION FILED JUNE 4, 1909.

Patented .ruhe 21,1910.

2 SHEETS-,SHEET 1.

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P. L. SCEGLI.. ROTARY SCREEN MGHANISM.

A?PLIUATIOI\T FILED JUNE 4, 1909.

maxima June 21, 1910.

2 SHEETS-SHEET 2.

@Humm m- UNITED STATES Pa- TENT OFFICE.

PETER L. BOHOLL, 0F READING, PENNSYLVANIA, ASSIGNOR TO OLIVER M, WEAND,0F READING, PENNSYLVANIA.

ROTARY SCREEN MECHANIBM.

To all whom 'it may comme:

Be it known that I, Pn'rnn L. SoHoL'L, a citizen of the United States,and a resident of the city ot' Reading, in the county of Berks and Stateof Pennsylvania, have in vented certain new and useful Improve` monts inRotary Screen Mechanism, of which the following is a specilication.

Mv invention relates to rotary screen mechanism adapted moreparticularly for separating the semi-solid matter in seivage from theliquid preliminary to requlsite treatment of the latter.

The main objects of the invent-ion are first to provide for more quicklyand satisfactorily effecting such separation and the conveyance anddelivery of the non-luid matter; second for more equally and effectivelyutilizing the portion of the screen forward of the inlet conduit; thirdfor utilizing the torce of the iuowiug stream in cleaning and operatingthe screen; and fourth for improving the skeleton struc-ture of thescreen and facilitating the application and renewal of the peripheralscreening-fabric. The improved construction whereby these severalobjects are attained is fully described in connect-ion with theaccompanying drawings and the novel features thereof are specificallypointed out in the claims.

Figure 1 is a sectional elevationof a rotary screen mechanismembodyinginy several iniprovements in preferred forni; a small part onlyot' the screen being shown in full elc ration with several of thescreening sections clamped to the .skeleton frame..

Fig. 2 1s a cross-sectional view on the line SH2 of Fig. 1 looking inthe direction of the arrow; the elevator buckets and iixed chuteprovided at the exit cud of the screen as shown in Fig. l beingindicated however in dotted lines.

The general form and mounting of the rotary screen A is similar to thatShown in Patent No. 869,720, issued October 29th, 1907; the sainecomprising a series of exterior rings 3, 3, 3, which are connected inproperly spaced relation by a circular ries of exterior longitudinalt-ic hars 4, -l-, having spacing tube-s 5, strung thereon between saidrings; and a cylindrical screening wall made up of an outer nettingr 6of relatively heavy Wire and large mesh and a` tine-r interior screenlining T, a plied in4 sections to the skeleton screename; and the latterbeing rotatively carried in Specllcation of Letters Patent.

Application filed June 4,

Patented J une 21, 1910.

1909. Serial No. 500,194.

fixed housing-rings B B B arranged concentric with the screen rings 3,3, B, and provided with suitably mounted and spaced supporting rollers15 upon whichsaid screen rings ride. The material to be screened issupplied by a fixed conduit C which enters the open inlet end of thescreen, and rotary motion is imparted to the latter through a suitabledriving mechanism coinprisinfr, as shown, a drive shaft D having gearwheels cl meshing with the toothed periphery 3 of the end rings 3.

In my improved construction the skeleton frame of the screen is formed,in connection with the spaced track-rings 3, 3, 3, by a series ofcircumferentially-spaced longitudinal ribs 10 secured to saidtrack-rings, and

spaced frame-rings each of Whic ,as shown, made up of a series of curvedsections 11, the ends 12 of which are rigidly secured to theintersecting longitudinal ribs, and the intermediate portions of which,extending bet-Ween said ribs, are made iiush exteriorly with the latter,as clearly shown in Fig. 2. The reinforcing netting 6 and finer screenlining T are jolntly applied to this skeleton frame in separatecomposite sections of rectan lar form, each of said sections being laiexteriorly upon said frame with the marginal portions thereofoverlapping and bearing upon said ribs 10 and ring sections 1lrespectively, and being clamped thereto by removably secured exteriorclamping rung-sections 13 and rib sections li. Eac i section of thescreening thus applied perinit-s of convenient renewal or repairs as required independentlyv of the other portions. An important object of myinvention is to provide for more Aquickly and eiieetively Separating anddeliverin the sludge or other non-fluid :nat-ter which is retained inthe screen by the liner inesh To this end I provide conveyer means forsuch nonuid matter, carried by the rotary screen and consisting, asshown, of un inwardlyextending blade or blades :'30 fixed to the in nerperiphery or screen wall thereof so as to forni a helical vano orfeed-worm; the action of which during rotation of the screen, upon suchnon-fluid matter, lis to move the latter toward the exit end of thescreen by constantly raising it. in the direction of rotation upon theforwardly pitched surface of the vane. As shown two continanintersecting series of lonvitudinallyuous ar'illel venes are provided,forming a dou la. worm of considerable pitch; the number and pitch ofthe vanes required to attain the best results in :articular cases be ingdetermined however y the character of the material treated, the size andspeed of rotation of the screen &c. he outer edges of the vane blades20, as shown, lie close to the screen wall, while the inner edges 21 areelevated in the direction of rotation above the radial line so as toform a shallow carrier-trough for the sludge, whereby the latter isretained upon the rising vanes whlle constantly falling thereon so as tobe conveyed to the exit end of the screen. The rigid connection of thesevane blades to the skeleton frame of the screen serves the furtherpurpose of greatly strengthening the latter.

In the construction shown, instead of discharging the sludge directlyfrom the terniinus of the vanos I provide for delivering the same to afixed chute 25, the upper end 2G of which extends into the open exit endof the screen While its lower end is arranged to deliver to an fconveniently located receptacle. To de iver the sludge conveyed by thevanes, to this fixed chute, I prot-'1de buckets QT on the exit end ofthe screen, projecting interiorly from a circular flange or baille ring28, and so located as to catch the sludge falling from the ends of thevane blades; said buckets being adapted, as the screen rotates, to carryupward the sludge thus received and to dump it into the chute 25 as theyare carried above the end 26 of the latter.

The manner of delivering the indowing stream of sewage or the like fromthe fixed conduit C to the rotary screen, is a matter of considerableimportance especially when the latter is provided with innenwall venesas described. In order to fully utilize a considerable length of screenand reduce and distribute the wear and tear uon the screen wall, Iprovide the inlet con uit C with a lateral-delivery discharge-end 30extending longitudinally into the screen and having an inclined ovcrfall31 (Fig. 2) the edge of which runs parallel with the screen wall; saidoverfall 31 connecting to the inwardly extended disehargeend 30 of theconduitwall above the bottom ot' the latter as shown so as to not onlydivert the flow laterally but to equalize its force and distribute itlengthwise of the screen. As shown the overfall 31 is directed towardthe descending wall of the screen, thereby reducing the injurious effectof the first Contact with the screening and at the same time utilizingthe force of the flow, by its contact with the vanos, to assist inrotating the screen. A further practical advantage of thus deliveringthe iuliowlng stl-cuni results from the cleaning action ol' the liquidupon the screening, whereby the necessity for special cleaningheretofore provided for is greatly reduced.

The several features of my complete invention as shown and describedcoperate in quickly and thoroughly effecting the selniration anddelivery of the non-Huid matter in sewage or the like, with a minimumcost of operation and maintenance of the ap aratus employed, but theymay obviously e utilized otherwise than specifically set forth u" houtdeparting from my invention.

l. A rotary screen for sewage or the like having a helical conveyer vaneon its inner periphery, the inner odge of said vane being elevated inthe direction of rotation above the radial line to forni a carriertrough.

2. A rotary screen for sewage or the like having an open exit end with abaille flange, a helical conveyor vane on its inner peripheryterminating short of said flange, and a dumpingreceptacle fixed to saidflange and having its inner edge elevated in the direction of rotation,in combination with a fixed delivery chute having its uiper end adaptedto directly receive the ischarge from the rising receptacle.

3- A rotary screen for sewage or the like having a helical conveyor vaneon its inner periphery the inner edge of which is elevated in thedirection of rotation, in combination with a central inlet. conduit tosaid screen having a lateral overfall extending therefrom toward thedescending portion of the vaned screen wall.

4. A rotary screen comprising a skeleton frame made up of a series ofcircumferentially-spaced longitudinal ribs, and a series oflongitudinally-spaced rings rigidly connected to said ribs and havintheir: exterior faces Hush with the exterior faces of said ribs,separate screening sections exteriorly laid upon said frame with themargina] portions thereof bearing upon said rings and ribs, and exteriorclamping ringsections and rib-sections separately bolted to saidframerings and ribs to removably secure said nettinf' sections.

In testimony ul'shereof, I affix my signature, in the presence of twowitnesses.

PETER L. SCHOLL.

Vitnesses D. M. STEWART, ADAM L. Omanm.

